objectid – инструмент для работы с ObjectId

class bson.objectid.ObjectId(oid=None)

ObjectId это 12-байтовый уникальный идентификатор, содержащий:

  • 4-byte value representing the seconds since the Unix epoch,
  • 3-byte machine identifier,
  • 2-byte process id, and
  • 3-byte counter, starting with a random value.
>>> ObjectId(b'foo-bar-quux')
ObjectId('666f6f2d6261722d71757578')
>>> ObjectId('0123456789ab0123456789ab')
ObjectId('0123456789ab0123456789ab')
>>> ObjectId(u'0123456789ab0123456789ab')
ObjectId('0123456789ab0123456789ab')
>>> o = ObjectId()
>>> o == ObjectId(str(o))
True
binary

12-байтовое бинарное представление объекта

classmethod from_datetime(generation_time)

Create a dummy ObjectId instance with a specific generation time.

This method is useful for doing range queries on a field containing ObjectId instances.

generation_time will be converted to UTC. Naive datetime instances will be treated as though they already contain UTC.

Warning

It is not safe to insert a document containing an ObjectId generated using this method. This method deliberately eliminates the uniqueness guarantee that ObjectIds generally provide. ObjectIds generated with this method should be used exclusively in queries.

>>> gen_time = datetime.datetime(2010, 1, 1)
>>> dummy_id = ObjectId.from_datetime(gen_time)
>>> result = collection.find({"_id": {"$lt": dummy_id}})
generation_time

A datetime.datetime instance representing the time of generation for this ObjectId.

The datetime.datetime is timezone aware, and represents the generation time in UTC. It is precise to the second.

classmethod is_valid(oid)

Checks if a oid string is valid or not.